Bus Hold (H) A bus-hold circuit is implemented in selected logic families to help solve the floating-input problem inherent in all CMOS inputs (refer to the application report, Implications of Slow or Floating CMOS Inputs, literature number SCBA004). The bus-hold circuit maintains the last known input state into the device and, as an additional benefit, pullup or pulldown resistors no longer are needed (see Figure below). The advantages of devices with this circuit are board-space savings and reduced component costs. This tutorial is based on the Understanding and Interpreting Standard Logic Data Sheets application report (SZZA036). To download the full PDF version of this application report, please use the following URL: http://www.ti.com/lit/szza036
Bus Hold (H)
A bus-hold circuit is implemented in selected logic families to help solve the floating-input problem inherent in all CMOS inputs (refer to the application report, Implications of Slow or Floating CMOS Inputs, literature number SCBA004). The bus-hold circuit maintains the last known input state into the device and, as an additional benefit, pullup or pulldown resistors no longer are needed (see Figure below). The advantages of devices with this circuit are board-space savings and reduced component costs.
This tutorial is based on the Understanding and Interpreting Standard Logic Data Sheets application report (SZZA036). To download the full PDF version of this application report, please use the following URL: http://www.ti.com/lit/szza036